<span>Q1=0 ,15 мкКл=0 ,15 *10^-6 Кл</span>
<span>Q2=3 нКл =3*10^-9Кл</span>
<span>r1=10 см=0,1м</span>
<span>r2=10м</span>
<span>А-?</span>
<span>решение</span>
<span>А=Wp1-Wp2=((Q1*Q2)/(4*Пи*Е0))*((d2-d1)/(d1*d2))=4,004*10^-5Дж</span>
Скорость света 3*10^8м/с
расстояние 3*10^8*1.28=3.84*10^8м= 384000км
Vср = [S1+S2]/[t1 + t2]
<span>S1 = S </span>
<span>S2 = 2S </span>
<span>t1 = S/30 </span>
<span>t2 = 2S/90 </span>
<span>Vср = [S + 2S]/[S/30 + 2S/90] = 3*90/[5S] = 54км/ч </span>
V=20 m/s
t=1min=60s
s=vt-at²/2
a=v/t=20/60=1/3 m/s²
s=20*60-1/3*60²/2=1200-1200/2=1200-600=600 m